diff --git a/lib/core/ResolveCache.js b/lib/core/ResolveCache.js
index 7453b22a..5b5af751 100644
--- a/lib/core/ResolveCache.js
+++ b/lib/core/ResolveCache.js
@@ -177,9 +177,9 @@ ResolveCache.prototype._sortVersions = function (versions) {
 
         // If both are semvers, compare them
         if (validSemver1 && validSemver2) {
-            if (semver.gt(validSemver1, validSemver2)) {
+            if (semver.gt(version1, version2)) {
                 return -1;
-            } else if (semver.lt(validSemver1, validSemver2)) {
+            } else if (semver.lt(version1, version2)) {
                 return 1;
             } else {
                 return 0;